水深及滩地糙率对复式断面河道过流能力的影响  

Influence of Water Depth and Beach Roughness to the Conveyance Capacity of Compound Channels

作　　者：姬昌辉[1] 张幸农[1] 谢瑞[1] 

机构地区：[1]南京水利科学研究院水文水资源与水利工程科学国家重点实验室,江苏南京210024

出　　处：《人民黄河》2015年第1期42-45,共4页Yellow River

基　　金：水利部公益性行业科研专项(201301068);水文水资源与水利工程科学国家重点实验室基本科研业务费重点项目(Y20809)

摘　　要：水深、滩地糙率是具有单、双槽复式断面河道过流能力的重要影响因素。采用数学模型计算并分析不同水深及滩地糙率情况下,概化的顺直型复式断面河道的过流能力,结果表明:当滩地水深与滩地高度之比增大时,滩地流量分配比随之增大,但增大的趋势越来越弱。随着滩地水深与滩地高度之比增大,河道水力坡降降低,在滩地水深与滩地高度之比小于0.4时,增大滩地水深与滩地高度之比对于减小水面比降效果明显。随着滩地糙率的增大,滩地流量分配比迅速减小,两者呈线性相关。Water depth and roughness are important influencing factors of the conveyance capacity of compound channel with single main channel or double main channels. This article analyzed the conveyance capacity of generalized straight compound channel with different water depth and beach roughness applying mathematical model. The results show that the diversion ratio of beach increases with the increasing of the ratio of water depth to height of beach,but the trend is smaller and smaller. Hydraulic gradient of river decreases with the increasing of ratio of water depth to height of beach. When the ratio of water depth to height of beach is less than 0. 4,the increasing of the ratio can de-crease dramatically hydraulic gradient of river. The diversion ratio of beach decreases rapidly and linearly with increasing roughness of beach.

关 键 词：复式断面河道 水深 糙率 水力坡降 分流比 

分 类 号：TV81[水利工程—水利水电工程]